DocumentCode
1002760
Title
Coding to increase number of channels in QAM-SCM-IM/DD lightwave system
Author
Wu, Jia-Han ; Lee, Young-Hyun ; Wu, Junyong
Author_Institution
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Volume
28
Issue
1
fYear
1992
Firstpage
65
Lastpage
67
Abstract
For a fibre-optic QAM-SCM-IM/DD system, clipping noise can severely limit the channel transport capability. A theoretical analysis of the QAM-SCM-IM/DD system employing BCH codes to increase the number of channels is presented. The relations among the system parameters such as received signal power, modulation index, and carrier-to-noise ratio are investigated. A general expression of the number of channels in terms of these parameters is also presented. The example shows that by using a (255, 239) BCH code, the number of channels can be increased up to fivefold, and the influence of clipping noise can also be greatly reduced.
Keywords
amplitude modulation; encoding; optical fibres; optical links; optical modulation; (255, 239) BCH code; BCH codes; carrier-to-noise ratio; channel transport capability; clipping noise; fibre-optic QAM-SCM-IM/DD system; intensity modulation/direct detection; modulation index; received signal power; subcarrier multiplexed; system parameters;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19920041
Filename
255927
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